IOS使用Core-Plot画折线图

关于Core-Plot的配置。大家能够參考我的上一篇博客：http://1.wildcat.sinaapp.com/?p=99

版权全部。转载请注明原文转自：http://blog.csdn.net/wildcatlele/article/details/25483923

大家能够到：http://1.wildcat.sinaapp.com/?p=102观看本篇博客更友好的排版格式

或者你英语好也能够參考github上的wiki介绍：https://code.google.com/p/core-plot/wiki/UsingCorePlotInApplications

先看一下效果图：

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好了以下说说详细使用吧：

1.改动ViewController.h文件例如以下：

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// //  ViewController.h //  CorePlotDemo // //  Created by wildcat on 14-5-9. //  Copyright (c) 2014年 com.wildcat. All rights reserved. // #import <UIKit/UIKit.h> #import "CorePlot-CocoaTouch.h"   @interface ViewController : UIViewController<CPTPlotDataSource> @property (nonatomic, strong) CPTGraphHostingView *hostView; @end

2.在.m文件里的implement以下加入

1	@synthesizehostView=hostView_;

3.在以下接着加入几个方法

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#pragma mark - UIViewController lifecycle methods -(void)viewDidAppear:(BOOL)animated {     [super viewDidAppear:animated];     [self initPlot]; }   #pragma mark - Chart behavior -(void)initPlot {     [self configureHost];     [self configureGraph];     [self configurePlots];     [self configureAxes];     }   -(void)configureHost {   }   -(void)configureGraph { }   -(void)configurePlots { }   -(void)configureAxes { }

4.在@end上边加入

#pragma mark - CPTPlotDataSource methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot{
    return0;
}

-(NSNumber *)numberForPlot:(CPTPlot *)plotfield:(NSUInteger)fieldEnumrecordIndex:(NSUInteger)index{
    return[NSDecimalNumberzero];
}

5.加入以下代码到-(void)configureHost函数：

self.hostView=[(CPTGraphHostingView *)[CPTGraphHostingViewalloc]initWithFrame:CGRectMake(0,10,self.view.bounds.size.width-10,self.view.bounds.size.height/2)];
    self.hostView.allowPinchScaling=YES;
    [self.viewaddSubview:self.hostView];

以上代码的主要作用就是声明一个视图用于画图。以下的折线图将绘制到这个视图上，然后加入为self.view的子视图。

6.加入以下代码到configureGraph:

//create an CPXYGraph and host it inside the view
    CPTTheme *theme=[CPTThemethemeNamed:kCPTPlainWhiteTheme];
    CPTXYGraph *graph=(CPTXYGraph *)[themenewGraph];
    graph.paddingLeft=10.0;
    graph.paddingTop=10.0;
    graph.paddingRight=10.0;
    graph.paddingBottom=10.0;
    self.hostView.hostedGraph=graph;
    CPTXYPlotSpace *plotSpace2=(CPTXYPlotSpace *)graph.defaultPlotSpace;
    //一屏内可显示的x，y方向的量度范围
    plotSpace2.xRange=[CPTPlotRangeplotRangeWithLocation:CPTDecimalFromCGFloat(-0.6)
                                                  length:CPTDecimalFromCGFloat(6.0)];
    plotSpace2.yRange=[CPTPlotRangeplotRangeWithLocation:CPTDecimalFromCGFloat(-1.0)
                                                  length:CPTDecimalFromCGFloat(10.0)];

    plotSpace2.allowsUserInteraction=YES;

7.加入以下代码到configurePlots:

 // 1 - Get graph and plot space
    CPTGraph *graph = self.hostView.hostedGraph;
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;

    //2:创建线性
    CPTMutableLineStyle *lineStyle=[CPTMutableLineStyle lineStyle];
    lineStyle.miterLimit        = 1.0f;
    lineStyle.lineWidth         = 3.0f;
    lineStyle.lineColor         = [CPTColor blueColor];

    //3.设置数据点
    CPTScatterPlot * lowScatterPlot  = [[CPTScatterPlot alloc] init];
    lowScatterPlot.dataLineStyle = lineStyle;
    lowScatterPlot.identifier    = @"LOWER";
    lowScatterPlot.dataSource    = self;   //设置数据源
    [graph addPlot:lowScatterPlot toPlotSpace:plotSpace];
        //....
    CPTScatterPlot * highScatterPlot  = [[CPTScatterPlot alloc] init];
    highScatterPlot.dataLineStyle = lineStyle;
    highScatterPlot.identifier    = @"HIGH";
    highScatterPlot.dataSource    = self;
    [graph addPlot:highScatterPlot toPlotSpace:plotSpace];

    //4.设置显示区域，滑动到数据点处
    [plotSpace scaleToFitPlots:[NSArray arrayWithObjects:lowScatterPlot,highScatterPlot, nil]];
    CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy];
    [xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
    plotSpace.xRange = xRange;
    CPTMutablePlotRange *yRange = [plotSpace.yRange mutableCopy];
    [yRange expandRangeByFactor:CPTDecimalFromCGFloat(1.2f)];
    plotSpace.yRange = yRange;

    //5.设置折线
    CPTMutableLineStyle *lowLineStyle = [lowScatterPlot.dataLineStyle mutableCopy];
    lowLineStyle.lineWidth = 2.0f;  //折线宽度
    lowLineStyle.lineColor = [CPTColor blueColor]; //折线颜色
    lowScatterPlot.dataLineStyle = lowLineStyle; //设置数据线样式
    CPTMutableLineStyle *lowSymbolLineStyle = [CPTMutableLineStyle lineStyle];
    lowSymbolLineStyle.lineColor = [CPTColor blueColor];
    //...
    CPTMutableLineStyle *highLineStyle = [lowScatterPlot.dataLineStyle mutableCopy];
    highLineStyle.lineWidth = 2.0f;  //折线宽度
    highLineStyle.lineColor = [CPTColor redColor]; //折线颜色
    highScatterPlot.dataLineStyle = highLineStyle; //设置数据线样式
    CPTMutableLineStyle *highSymbolLineStyle = [CPTMutableLineStyle lineStyle];
    highSymbolLineStyle.lineColor = [CPTColor redColor];

    //6.设置拐点
    CPTPlotSymbol *lowSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    lowSymbol.fill = [CPTFill fillWithColor:[CPTColor blueColor]];
    lowSymbol.lineStyle = lowSymbolLineStyle;
    lowSymbol.size = CGSizeMake(6.0f, 6.0f); //拐点大小
    lowScatterPlot.plotSymbol = lowSymbol;

    CPTPlotSymbol *highSymbol = [CPTPlotSymbol ellipsePlotSymbol];
    highSymbol.fill = [CPTFill fillWithColor:[CPTColor redColor]];
    highSymbol.lineStyle = highSymbolLineStyle;
    highSymbol.size = CGSizeMake(6.0f, 6.0f); //拐点大小
    highScatterPlot.plotSymbol = highSymbol;

以上代码主要是设置折线、拐点的类型以及设置高低温两个折线图.最重要的是加入数据源 .dataSource    = self;

8.设置x、y轴的间隔及细分刻度等。加入以下代码到configureAxes函数：

CPTGraph *graph=self.hostView.hostedGraph;

    //1:创建线性
    CPTMutableLineStyle *lineStyle=[CPTMutableLineStylelineStyle];
    //axes 设置x,y轴属性。如原点。
    //得到x，y轴的集合
    CPTXYAxisSet *axisSet=(CPTXYAxisSet *)graph.axisSet;
    lineStyle.miterLimit=1.0f;
    lineStyle.lineWidth=0.5f;
    lineStyle.lineColor=[CPTColorblueColor];
    //设置x轴线
    CPTXYAxis *x=axisSet.xAxis;
    x.orthogonalCoordinateDecimal=CPTDecimalFromString(@"0");//原点为0.(y=0）
    x.majorIntervalLength=CPTDecimalFromString(@"1");// x轴主刻度：显示数字标签的量度间隔

    x.minorTicksPerInterval=0;// x轴细分刻度：每个主刻度范围内显示细分刻度的个数
    x.minorTickLineStyle=lineStyle;

    //设置y 轴
    CPTXYAxis *y=axisSet.yAxis;
    y.orthogonalCoordinateDecimal=CPTDecimalFromString(@"0");
    y.majorIntervalLength=CPTDecimalFromString(@"1");
    y.minorTicksPerInterval=0;
    y.minorTickLineStyle=lineStyle;

9.设置数据源方法，改动两个方法例如以下：

#pragma mark - CPTPlotDataSource methods
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot {
    return 4; //数据点个数
}
static int a=1;
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index {

    switch (fieldEnum) {
        case CPTScatterPlotFieldX:
            if (a>4) {
                a=1;
            }
                return [NSNumber numberWithInt:a++];
            break;

        case CPTScatterPlotFieldY:
            if ([plot.identifier isEqual:@"LOWER"] == YES) {
                return [NSNumber numberWithInt:arc4random()%8];
            }else if([plot.identifier isEqual:@"HIGH"] == YES){
                return [NSNumber numberWithInt:arc4random()%8+10];
            }

            break;
    }
    return [NSDecimalNumber zero];
}

好了一切设置完成执行看看效果。

补充：

Core Plot 框架结构分析

CorePlot 的类结构关系例如以下：

当中最核心的就是 CPTGraph，本演示样例中的 CPTXYGraph是它的子类；一个图 CPTGraph包括一个轴集 CPTAxiset。每个轴集可包括多个轴；一个图 CPTGraph 可包括多个图空间 CPTPlotSpace；一个图 CPTGraph 可包括多个图形CPTSplot（曲线，饼图，柱状图等）；图形CPTSplot 和轴都展如今某个图空间 CPTPlotSpace 中。

其余的部分，尚未介绍到。暂且不提。

或许下图能更形象地描写叙述出 Core Plot 各种对象之间的关系。